Built-In ADC for Low Bandwidth Telephony Over LAN

[CouchDweller]

Howdy,

I would like to use the ESP32 built-in ADC to acquire low-bandwith (~4kHz, ~8K samps/sec) analog telephony audio and send audio over my LAN.

I have already been successful sending the test tone per...
arduino-audio-tools/examples/examples-communication/communication-ip-send/communication-ip-send.ino

Now trying to figure out how to substitute...
GeneratedSoundStream<int16_t> sound( sineWave); // Stream generated from sine wave
...with commands to use the ADC (also specifying sample rate, amplitude scaling, and sample bitness), but can't quite figure out how.

Any advice would be super duper appreciated.

Cheers,

CD

[pschatzmann]

You would use a AnalogAudioStream as input and to manage the volume you can use the logic described in VolumeControl

You might also want to consider to use a codec
Please note that the AnalogAudioStream is providing 2 channels and you might want to reduce it to one